在Java中使用HttpURLConnection时拒绝连接

Question

我在本地主机上使用WAMP服务器，并且有一个小型Java软件可以从PHP文件获取响应。 当我尝试从HttpURLConnection对象获取InputStream时（也当我尝试获取responseCode或responseMessage ...时），出现以下错误。 请帮帮我。

错误信息：

Exception in thread "main" java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1202)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:966)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
    at javaapplication1.JavaApplication1.main(JavaApplication1.java:28)
C:\Users\Amine\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1

Java代码：

public static void main(String[] args) throws MalformedURLException, IOException 
{
    URL url = new URL("http://localhost/test/test.php");
    HttpURLConnection con  = (HttpURLConnection) url.openConnection();
    System.out.println(con.getResponseCode());
}

PHP脚本（C：\\ wamp \\ www \\ test \\ test.php）：

<?php echo "Hello world"; ?>

Answer 1

检查您的防火墙设置。

看来浏览器已允许连接到localhost：80，但您的Java应用程序已禁用该连接。

Answer 2

好吧，我已经解决了问题，这是与WAMP服务器有关。 我删除了它，然后又重新安装了它。 现在可以正常工作了。